[Fix] Subtasks process queued feedback before returning

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What changed

Messages sent while the active task is streaming are added to that task's queue synchronously, before the task can finish. A focused VS Code e2e delays child completion, sends a queued instruction, verifies the child processes it, and only then permits the parent to resume.

The branch also retains a three-line Electron Node-mode setup for the MCP e2e fixture. Removing it was tested and causes the complete mocked e2e suite to fail during MCP setup because the inherited pnpm executable emits non-JSON output.

Why this change was made

Queued instructions could lose a race with delegated child completion. The lifecycle-side approval and durable-feedback behavior now lives on main; this PR is intentionally limited to ensuring streaming input reaches the active child before that lifecycle logic runs, plus regression coverage for the full child-to-parent boundary.

Impact

Subtasks receive queued steering before they can return control to their parent. No image normalization, validation, or broader public API contract changes are included.

Linked work items

Closes #1308
Tracked under #355

Related PRs

• Documentation: [Docs] Clarify queued feedback during subtask completion Zoo-Code-Docs#39

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Actionable comments posted: 1

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In `@src/core/mentions/resolveImageMentions.ts`:
- Around line 141-143: Update resolveImageMentions so each validated local
image’s returned dataUrl is checked against existingImages and newImages before
adding it or calling ImageMemoryTracker.addMemoryUsage; skip duplicates while
preserving unique-image accounting. Add a regression covering supplied image A,
duplicate local A, and unique local B within maxTotalImageSize.

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src/core/mentions/resolveImageMentions.ts (1)

54-56: LGTM!

Also applies to: 81-81

src/core/mentions/__tests__/resolveImageMentions.spec.ts (1)

14-19: LGTM!

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Inline comments:
In `@src/extension/__tests__/api.spec.ts`:
- Around line 278-280: Update the SendMessage test setup to mock IpcServer and
capture its IpcMessageType.TaskCommand callback, then invoke that callback with
a TaskCommandName.SendMessage command. Assert both the expected log output and
message delivery through the registered handler instead of calling
api.sendMessage directly.

In `@src/extension/api.ts`:
- Line 343: Update the SendMessage branch in IpcServer.onMessage to catch
rejected sendMessage calls, log the failure, and return a controlled IPC result
using the same handling pattern as ResumeTask. Ensure invalid streaming input
failures do not become unhandled promise rejections.

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🔇 Additional comments (5)

src/core/mentions/__tests__/resolveImageMentions.spec.ts (1)

3-29: LGTM!

Also applies to: 204-310

src/extension/api.ts (1)

17-17: LGTM!

Also applies to: 30-30, 256-304, 327-342, 344-349, 416-425

src/extension/__tests__/api.spec.ts (1)

1-277: LGTM!

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